CN103391001B - For the high-gain DC/DC converter of MPPT link of photovoltaic inverter - Google Patents

For the high-gain DC/DC converter of MPPT link of photovoltaic inverter Download PDF

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Publication number
CN103391001B
CN103391001B CN201310336078.6A CN201310336078A CN103391001B CN 103391001 B CN103391001 B CN 103391001B CN 201310336078 A CN201310336078 A CN 201310336078A CN 103391001 B CN103391001 B CN 103391001B
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inductance
power switch
converter
power
gain
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CN201310336078.6A
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CN103391001A (en
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蔡鹏�
王小峰
杨树
汤雨
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POWERWILL NEW ENERGY TECHNOLOGY Co Ltd
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POWERWILL NEW ENERGY TECHNOLOGY Co Ltd
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Abstract

The invention discloses a kind of High-gain DCDC converter for MPPT link of photovoltaic inverter, comprise the double pipe structure with two power switch pipes, direct voltage source, power output diode and filter capacitor, direct voltage source is connected with the input of double pipe structure, power output diode is connected with the output of double pipe structure with after filter capacitor series connection, filter capacitor is the output of dcdc converter, preferably, be provided with coupling inductance construction unit, form the pattern conversion of the two-tube boosting of coupling inductance, step-up ratio can be brought up to higher level by the present invention, thus make up the defect of traditional B oost circuit for photovoltaic DC-to-AC converter, and it is high to have boosting gain, volume is little, conversion efficiency is high, the advantage that master power switch tube voltage stress is low.

Description

For the high-gain DC/DC converter of MPPT link of photovoltaic inverter
Technical field
The present invention relates to a kind of DC/DC converter, specifically relate to a kind of high-gain DC/DC converter for MPPT link of photovoltaic inverter.
Background technology
At present, distributed photovoltaic power generation development and application become one of the most effective new forms of energy application mode.Distributed photovoltaic power generation system generally includes photovoltaic battery panel and from/grid-connected photovoltaic inverter, wherein photovoltaic DC-to-AC converter is the main technologies realizing the direct current that photovoltaic cell exports to be converted to alternating current.General photovoltaic DC-to-AC converter inside comprises maximum power tracing (MPPT) link and AC/DC (DC/AC) inverter link.Because cell panel cell voltage is lower, in order to meet the needs of rear class DC/AC inversion, prime MPPT link needs to adopt DC-to-DC (DC/DC) converter of high-gain significantly to promote DC voltage level usually.
Photovoltaic DC-to-AC converter is in order to realize maximum power tracing (MPPT), general prime needs to adopt DC/DC converter, become a kind of stable output voltage for the work of rear class DC/AC inverter photovoltaic (PV) voltage transformation of change, normal DC/DC converter mainly buck chopper (Buck reduction voltage circuit) and the boost chopper (Boost circuit) etc. adopted.Wherein Boost circuit is because continuous input current, and operating voltage range is wide, becomes the first-selection of MPPT link.But the feature of traditional Boost circuit itself determines its duty ratio can not excessive (being generally no more than 70%), and this causes Boost circuit to be difficult to the boost in voltage of the photovoltaic cell of monomer to higher busbar voltage level.Like this, when PV voltage is lower, the normal work of rear class DC/AC inverter link cannot be ensured.Therefore, need the DC/DC converter applications of more high-gain in MPPT link, but the larger input current brought thus requires again to select the low tension switch pipe of low on-resistance to reduce on-state loss, namely require that the voltage stress of switching tube is low, so how the voltage gain of Lifting Transform device reduces the voltage stress of switching tube simultaneously, become key issue in the urgent need to address.
With regard to prior art, solution to this problem is by isolated form DC/DC converter as push-pull converter etc. mostly, and the DC/DC converter of such form needs isolation sampling, drives, and realizes cost higher; In addition, also have and to adopt cascade connection type converter and switched inductors/switching capacity quasi-converter, but, cascade connection type converter is due to needs boosted voltage step by step, therefore the comparatively complicated and inefficiency of structure, and the gain of switched inductors/switching capacity quasi-converter is limited, and power switch pipe voltage stress/current stress is larger.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of high-gain DC/DC converter for MPPT link of photovoltaic inverter, and have boosting gain high, volume is little, and conversion efficiency is high, the advantage that master power switch tube voltage stress is low.
Technical scheme of the present invention is achieved in that
A kind of high-gain DC/DC converter for MPPT link of photovoltaic inverter, comprise the double pipe structure with two power switch pipes, direct voltage source, power output diode and filter capacitor, described direct voltage source is connected with the input of described double pipe structure, described power output diode is connected with the output of described double pipe structure with after described filter capacitor series connection, described filter capacitor is the output of described DC/DC converter, while described double pipe structure can increase the output voltage gain of described DC/DC converter, reduce the voltage stress of described power switch pipe.
As a further improvement on the present invention, while described double pipe structure can increase the output voltage gain of described DC/DC converter, the structure reducing the voltage stress of described power switch pipe is: described double pipe structure comprises the first inductance, the second inductance, the first power switch pipe, the second power switch pipe; Wherein, the anode of described first power switch pipe, one end of described first inductance are connected with the positive pole of described direct voltage source respectively, the other end of described first inductance is connected with the anode of described second power switch pipe, the negative electrode of described second power switch pipe, one end of described second inductance are connected with the negative pole of described direct voltage source respectively, and the other end of described second inductance is connected with the negative electrode of described first power switch pipe.
As a further improvement on the present invention, be provided with coupling inductance construction unit, described coupling inductance construction unit replaces described first inductance, and described coupling inductance construction unit comprises: the first power diode, the second power diode and the 3rd inductance intercoupled and the 4th inductance; Wherein, described 3rd inductance, described 4th inductance, described first power diode are connected successively, forward current from described direct voltage source flows into the Same Name of Ends of described 3rd inductance and described 4th inductance, and flow into the anode of described first power diode, tie point between anode described 3rd inductance of access of described second power diode and the 4th inductance, the negative electrode of described second power diode is connected with the negative electrode of described first power diode.
As a further improvement on the present invention, described 3rd inductance and described 4th inductance intercouple, and forward current flows to the Same Name of Ends of described 3rd inductance and described 4th inductance simultaneously.
As a further improvement on the present invention, described first power switch pipe is the one in metal-oxide-semiconductor and IGBT pipe, and described second power switch pipe is the one in metal-oxide-semiconductor and IGBT pipe.
The invention has the beneficial effects as follows: the invention provides a kind of high-gain DC/DC converter for MPPT link of photovoltaic inverter, the two-tube boost approach of coupling inductance adopted, carry out reformed AHP in traditional Boost circuit, by the pattern conversion of the two-tube boosting of coupling inductance, step-up ratio can be brought up to higher level, thus make up traditional B oost booster circuit for defect during photovoltaic DC-to-AC converter.In addition, it is high that the present invention has boosting gain, and volume is little, and conversion efficiency is high, the advantage that master power switch tube voltage stress is low.Adopt technical solution of the present invention, when circuit cost and the increase of control difficulty are very little, photovoltaic DC-to-AC converter can be made to have wider MPPT scope, improve flexibility and the range of application of photovoltaic DC-to-AC converter configuration.
Accompanying drawing explanation
Fig. 1 is circuit theory schematic diagram of the present invention;
Fig. 2 is that the present invention is at input voltage V i=20V, the first power switch tube S 1, the second power switch tube S 2duty ratio D=0.646, load R l=200 Ω, when the coupling inductance turn ratio is 1:1:2 experiment, the waveform of the first power switch tube voltage;
Fig. 3 is that the present invention is at input voltage V i=20V, the first power switch tube S 1, the second power switch tube S 2duty ratio D=0.646, load R l=200 Ω, when the coupling inductance turn ratio is 1:1:2 experiment, the waveform of the second power switch tube voltage;
Fig. 4 is that the present invention is at input voltage V i=20V, the first power switch tube S 1, the second power switch tube S 2duty ratio D=0.646, load R l=200 Ω, when the coupling inductance turn ratio is 1:1:2 experiment, the waveform of the 3rd inductive current;
Fig. 5 is that the present invention is at input voltage V i=20V, the first power switch tube S 1, the second power switch tube S 2duty ratio D=0.646, load R l=200 Ω, when the coupling inductance turn ratio is 1:1:2 experiment, the waveform of the 4th inductive current;
Fig. 6 is that the present invention is at input voltage V i=20V, the first power switch tube S 1, the second power switch tube S 2duty ratio D=0.646, load R l=200 Ω, when the coupling inductance turn ratio is 1:1:2 experiment, the waveform of the second inductive current;
Fig. 7 is that the present invention is at input voltage V i=20V, the first power switch tube S 1, the second power switch tube S 2duty ratio D=0.646, load R l=200 Ω, when the coupling inductance turn ratio is 1:1:2 experiment, the waveform of filter capacitor voltage.
By reference to the accompanying drawings, make the following instructions:
V i---direct voltage source D 0---power output diode
C---filter capacitor L 2---the second inductance
S 1---the first power switch tube S 2---the second power switch pipe
D 1a---the first power diode D 1b---the second power diode
L 1a---the 3rd inductance L 1b---the 4th inductance
R l---supported V o---filter capacitor voltage
Embodiment
As shown in Figure 1, a kind of high-gain DC/DC converter for MPPT link of photovoltaic inverter, comprises double pipe structure, the direct voltage source V with two power switch pipes i, power output diode D 0with filter capacitor C, direct voltage source V ibe connected with the input of double pipe structure, power output diode D 0be connected with the output of double pipe structure after connecting with filter capacitor C, filter capacitor C is the output of DC/DC converter, load R lbe attempted by the output of filter capacitor C.
Preferably, double pipe structure comprises the first inductance, the second inductance L 2, the first power switch tube S 1, the second power switch tube S 2; Wherein, the first power switch tube S 1anode, the first inductance one end respectively with direct voltage source V ipositive pole be connected, the other end of the first inductance and the second power switch tube S 2anode be connected, the second power switch tube S 2negative electrode, the second inductance L 2one end respectively with direct voltage source V inegative pole be connected, the second inductance L 2the other end and the first power switch tube S 1negative electrode connect.
Preferably, be provided with coupling inductance construction unit, coupling inductance construction unit replaces the first inductance, and coupling inductance construction unit comprises: the first power diode D 1a, the second power diode D 1bwith the 3rd inductance L intercoupled 1awith the 4th inductance L 1b; Wherein, the 3rd inductance L 1a, the 4th inductance L 1b, the first power diode D 1aconnect successively, from direct voltage source V iforward current flow into the 3rd inductance L 1awith the 4th inductance L 1bsame Name of Ends, and flow into the first power diode D 1aanode, the second power diode D 1banode access the 3rd inductance L 1awith the 4th inductance L 1bbetween tie point, the second power diode D 1bnegative electrode and the first power diode D 1anegative electrode be connected.
Preferably, the 3rd inductance L 1awith the 4th inductance L 1bintercouple, and forward current flows to the 3rd inductance L simultaneously 1awith the 4th inductance L 1bsame Name of Ends.
Preferably, the first power switch tube S 1for the one in metal-oxide-semiconductor and IGBT pipe, the second power switch tube S 2for the one in metal-oxide-semiconductor and IGBT pipe.
Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are input voltage V i=20V, the first power switch tube S 1with the second power switch tube S 2duty ratio D=0.5, load R l=100 Ω, when the coupling inductance turn ratio is 1:1:2, the first power switch tube voltage 1, the second power switch tube voltage, the 3rd inductive current, the 4th inductive current, the second inductive current and output filter capacitor voltage waveform.When first power switch pipe and the second power switch pipe turn off as we can see from the figure, the voltage stress of power switch pipe is little, the fluctuation of coupling inductance current waveform is little and inductor current value is little, and filter capacitor voltage (i.e. output voltage) has larger voltage gain.Therefore, while the present invention can increase the output voltage gain of DC/DC converter, reduce the voltage stress of power switch pipe.During concrete enforcement, inductance value can be selected little and the inductance that volume is little, and two coupling inductance size of current are identical, a volume magnetic core further reducing booster converter can be coupling in.Visible, the high-gain DC/DC converter that the present invention is used for MPPT link of photovoltaic inverter has less power switch pipe voltage stress and larger voltage gain, reduces converter volume under the prerequisite ensureing high-conversion rate simultaneously.
In sum, the invention provides a kind of high-gain DC/DC converter for MPPT link of photovoltaic inverter, the two-tube boost approach of coupling inductance adopted, carry out reformed AHP in traditional Boost circuit, by the pattern conversion of the two-tube boosting of coupling inductance, step-up ratio can be brought up to higher level, thus make up traditional B oost booster circuit for defect during photovoltaic DC-to-AC converter.In addition, it is high that the present invention has boosting gain, and volume is little, and conversion efficiency is high, the advantage that master power switch tube voltage stress is low.Adopt technical solution of the present invention, when circuit cost and the increase of control difficulty are very little, photovoltaic DC-to-AC converter can be made to have wider MPPT scope, improve flexibility and the range of application of photovoltaic DC-to-AC converter configuration.
Above embodiment is with reference to accompanying drawing, to a preferred embodiment of the present invention will be described in detail.Those skilled in the art by carrying out amendment on various forms or change to above-described embodiment, but when not deviating from essence of the present invention, drops within protection scope of the present invention.

Claims (4)

1. for a high-gain DC/DC converter for MPPT link of photovoltaic inverter, it is characterized in that: comprise double pipe structure, the direct voltage source (V with two power switch pipes i), power output diode (D 0) and filter capacitor (C), described direct voltage source is connected with the input of described double pipe structure, described power output diode is connected with the output of described double pipe structure with after described filter capacitor series connection, described filter capacitor is the output of described DC/DC converter, while described double pipe structure can increase the output voltage gain of described DC/DC converter, reduce the voltage stress of described power switch pipe, while described double pipe structure can increase the output voltage gain of described DC/DC converter, the structure reducing the voltage stress of described power switch pipe is: described double pipe structure comprises the first inductance, second inductance (L 2), the first power switch pipe (S 1), the second power switch pipe (S 2), wherein, the anode of described first power switch pipe, one end of described first inductance are connected with the positive pole of described direct voltage source respectively, the other end of described first inductance is connected with the anode of described second power switch pipe, the negative electrode of described second power switch pipe, one end of described second inductance are connected with the negative pole of described direct voltage source respectively, and the other end of described second inductance is connected with the negative electrode of described first power switch pipe.
2. the high-gain DC/DC converter for MPPT link of photovoltaic inverter according to claim 1, it is characterized in that: be provided with coupling inductance construction unit, described coupling inductance construction unit replaces described first inductance, and described coupling inductance construction unit comprises: the first power diode (D 1a), the second power diode (D 1b) and the 3rd inductance (L that intercouples 1a) and the 4th inductance (L 1b); Wherein, described 3rd inductance, described 4th inductance, described first power diode are connected successively, forward current from described direct voltage source flows into the Same Name of Ends of described 3rd inductance and described 4th inductance, and flow into the anode of described first power diode, tie point between anode described 3rd inductance of access of described second power diode and described 4th inductance, the negative electrode of described second power diode is connected with the negative electrode of described first power diode.
3. the high-gain DC/DC converter for MPPT link of photovoltaic inverter according to claim 2, it is characterized in that: described 3rd inductance and described 4th inductance intercouple, and forward current flows to the Same Name of Ends of described 3rd inductance and described 4th inductance simultaneously.
4. the high-gain DC/DC converter for MPPT link of photovoltaic inverter according to any one of claims 1 to 3, it is characterized in that: described first power switch pipe is the one in metal-oxide-semiconductor and IGBT pipe, described second power switch pipe is the one in metal-oxide-semiconductor and IGBT pipe.
CN201310336078.6A 2013-08-05 2013-08-05 For the high-gain DC/DC converter of MPPT link of photovoltaic inverter Expired - Fee Related CN103391001B (en)

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CN103618449A (en) * 2013-11-15 2014-03-05 南京航空航天大学 Three-winding coupling inductance double tube boost converter with charge pump
CN103944384A (en) * 2014-04-18 2014-07-23 南京航空航天大学 Coupling inductance high-gain active network boost converter
CN105141160A (en) * 2015-08-24 2015-12-09 苏州市博得立电源科技有限公司 Vehicle-mounted power supply photovoltaic inverter
CN108768172B (en) * 2018-06-12 2019-08-09 西安空间无线电技术研究所 A kind of high-gain boost converter of continuous input current
CN109742966B (en) * 2018-12-27 2020-05-22 西安交通大学 Switched capacitor-based single-phase grid-connected fifteen-level inverter topological structure
CN111987924B (en) * 2020-08-18 2022-09-06 国网福建省电力有限公司检修分公司 Single-stage single-phase high-gain combined boost inverter circuit and boost inversion method

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Publication number Priority date Publication date Assignee Title
JP2000308337A (en) * 1999-04-19 2000-11-02 Amada Eng Center Co Ltd Two-phase dc-dc converter preventing reverse recovery current of feedback diode
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CN102946194A (en) * 2012-12-12 2013-02-27 重庆大学 High-gain interleaving boost converter
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